To help maintain proper pH levels and reduce harmful metals, a pH conditioner can be added to your aquarium.
Things to Consider:
Different Species -- pH stabilizers are great for tanks that have several different species. pH levels can be set at a neutral place that is ideal for all fish.
Adding fish -- If you plan to add other fish to your aquarium, there are products available, such as StartRight Tankbuddies.
Plus or Minus -- pH kits are available to help you determine your aquarium level, and determine whether you need a product for plus or minus pH.